[CHEM 1P00] - Midterm Exam Guide - Ultimate 33 pages long Study Guide!
7 Feb 2017
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Surface chemistry is the branch of chemistry which deals with the phenomenon that occurs on the surfaces or interfaces, such phenomenon includes corrosion. catalysis, crystallisation, etc. Due to unbalanced attraction forces, accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. Charcoal, silica gel, metals such as ni, cu, ag, pt and colloids are some adsorbents. Important characteristics of adsorption: it is specific and selective in nature, adsorption is spontaneous process, therefore change in free energy ( g)is negative. For the negative value of g,in a system, in which randomness decreases, h must be negative. Adsorption of hydrogen over pt is called occlusion. It is a process of removing an adsorbed substance from a surface on which it is adsorbed, is known as desorption. It is a process in which both adsorption and absorption take place simultaneously, the term sorption is simply used.
